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Plasma display apparatus and driving method thereof

a technology of display apparatus and plasma, which is applied in the direction of electric digital data processing, instruments, computing, etc., can solve the problems of excessive displacement current flowing through the data driver ic, electrical damage, and lowering the contrast value of dark room, so as to reduce noise generation and prevent the generation of erroneous discharge

Inactive Publication Date: 2009-12-29
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0056]It is an object of the present invention to provide a plasma display apparatus and driving method thereof, in which a discharge is stabilized under high temperature environment and scanning is performed according to selected one or more of a plurality of scan types, preventing electrical damage to an driver IC.
[0058]The present invention can reduce generation of noise and stabilize a discharge of a PDP under high temperature environment. It is thus possible to prohibit generation of an erroneous discharge depending on a temperature.

Problems solved by technology

More particularly, in the case of a specific pattern in which a logic value of image data is repeated between 0 and 1, the amount of the displacement current flowing through the data driver IC is excessively increased.
Therefore, there is a problem in electrical damage such as a burnt data driver IC.
Therefore, problems arise because a dark room contrast value is lowered and the contrast ratio is lowered accordingly.
Furthermore, in the conventional plasma display apparatus, in the case where negative wall charges are excessively accumulated on the scan electrodes Y since wall charges are not smoothly erased in the erase period (EP) of the (n−1)th sub-field (SFn−1), a dark discharge is not generated in the set-up period (SU) of the nth sub-field (SFn).
If the dark discharge is not generated in the set-up period (SU), a condition within the discharge cells immediately after the reset period does not become an optimal address condition.
This results in an abnormal discharge or erroneous discharge.
Therefore, initialization is not uniform over the entire cells.
In other words, if a strong erase discharge is generated in the erase period prior to the reset period, an erroneous discharge can be generated.
Consequently, if an erase discharge is not generated or is very weakly generated in the erase period prior to the reset period, an erroneous discharge or an abnormal discharge is generated because initialization is not normally performed.
However, the erase operation can be performed abnormally depending on the uniformity of discharge cells and a use temperature of a PDP, as described above.
Furthermore, in the conventional plasma display apparatus, an erroneous discharge, miss-discharge or an abnormal discharge can be generated due to excessive spatial charges occurring under a high-temperature environment and an unstable wall charge distribution due to the amount of active motion of the spatial charges.
Therefore, a problem arises because operational margin is narrowed.
Therefore, if the driving waveform as shown in FIG. 5 is applied to a PDP used under high temperature environment, a problem arises because miss-writing of on-cells is frequently generated.
Therefore, an erroneous discharge is generated because an absolute amount of wall charges that take part in a discharge is reduced.
This makes unstable the address discharge.
This further makes unstable the address discharge.
Therefore, a high temperature erroneous discharge, such as that discharge cells, which have been turned on in the address period, are turned off in the sustain period, is generated.
Therefore, a problem arises because a high temperature erroneous discharge is generated.

Method used

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first embodiment

[0105]FIGS. 9a and 9b are views illustrating a driving method of a plasma display apparatus according to the present invention.

[0106]Referring first to FIG. 9a, in the method of driving the plasma display apparatus according to a first embodiment of the present invention, the plasma display apparatus is driven with a driving waveform being divided into a reset period, an address period and a sustain period in one frame, as described above.

[0107]In a set-up period of the reset period, a ramp-up waveform (Ramp-up) is applied to scan electrodes Y. The ramp-up waveform generates a weak dark discharge within discharge cells of the entire screen. The ramp-up discharge also causes positive wall charges to be accumulated on data electrodes X and sustain electrodes Z, and negative wall charges to be accumulated on the scan electrodes Y.

[0108]In a set-down period of the reset period, after the ramp-up waveform is applied to the scan electrodes Y, a ramp-down waveform (Ramp-down), which falls ...

second embodiment

[0293]FIG. 27 is a view illustrating a method of controlling a difference between an application time of a last sustain pulse and an application time of a reset pulse applied in a reset period of a next sub-field according to the present invention.

[0294]Referring to FIG. 27, (a) of FIG. 27 shows the relation between a last sustain pulse (SUSL) applied in a sustain period of any one of sub-fields and a reset pulse applied in a reset period of a next sub-field. FIG. 27 shows a case where the last sustain pulse (SUSL) is applied to the scan electrodes Y. It is, however, to be noted that the last sustain pulse (SUSL) can be applied to the sustain electrodes Z.

[0295](b) of FIG. 27 shows a difference (Ws2) between application times in the remaining sustain pulses other than the last sustain pulse (SUSL).

[0296]Referring to (a), a time lag of Ws1 is placed between then application time of the last sustain pulse (SUSL) and the application time of a reset pulse applied in a reset period of a ...

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Abstract

The present invention relates to a plasma display apparatus, and more particularly, to a plasma display apparatus and driving method thereof, in which scan electrodes are scanned according to one of a plurality of scan types and a last sustain pulse of sustain pulses applied to scan electrodes or sustain electrodes is controlled. The plasma display apparatus of the present invention comprises a plasma display panel comprising a plurality of scan electrodes, a plurality of sustain electrodes, and a plurality of data electrodes crossing the plurality of scan electrodes and the sustain electrodes, and a controller for scanning the scan electrodes using one of a plurality of scan types in which the order of scanning the plurality of scan electrodes is different in an address period, applies a data pulse to the data electrodes corresponding to one scan type, and controls a difference between an application time point of a last sustain pulse of sustain pulses, which are applied to the scan electrodes or the sustain electrode in a sustain period subsequent to the address period, and a application time point of a reset pulse, which is applied to the scan electrodes in a reset period of a next sub-field, to be greater than a difference between application time points of the two sustain pulses, in at least one of sub-fields of a frame.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This Nonprovisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 10-2004-0095455 filed in Republic of Korea on Nov. 19, 2004, Patent Application No. 10-2005-0090172 filed in Republic of Korea on Sep. 27, 2005, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a plasma display apparatus, and more particularly, to a plasma display apparatus and driving method thereof, in which scan electrodes are scanned according to one of a plurality of scan types and a last sustain pulse of sustain pulses applied to scan electrodes or sustain electrodes is controlled.[0004]2. Background of the Related Art[0005]In general, a plasma display panel comprises a front panel and a rear panel. Barrier ribs formed between the front panel and the rear panel form one cell. Each cell is filled with a primary discharge gas...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G09G3/28G09G3/20G09G3/288G09G3/291G09G3/292G09G3/294G09G3/296G09G3/298
CPCG09G3/292G09G3/294G09G2330/021G09G2320/041G09G2310/0267
Inventor JUNG, YUNKWONKANG, SEONGHOYOON, SANGJINSIM, SOOSEOK
Owner LG ELECTRONICS INC
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